Basically after RT supposedly died, Leela went to doctors for something. The doctor was Anita's husband (Yuvi's father) and he made cheap movements on Leela after which she slapped him and left from there. Anita found out about her husband's cheating and blamed Leela because her husband left her.
And thats where all this Tashan began.
YO GUYS, wasnt Leela pregnant with Twinkle when she went for the check up? Because I remember Anita's husband saying something along the lines of "she needs support and a father figure" and what not. If thats the case then how dafuq did Mahi happen?